The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2007
Filed:
Jul. 10, 2001
Motoki Higashida, Tokyo, JP;
Motoki Higashida, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
There is disclosed a method for reducing leakage current of an LSI, which enables information not memory-mapped in the address of a CPU to be easily saved, and information saving and returning to be carried out by simple switching operations without needing any special switching operations by the CPU. An LSI chip is divided into two parts, namely a main power supply region and a backup power supply region. A scan path is provided to interconnect memory units including a CPU, a CPU peripheral circuit and so on, in the main power supply region. When an operation standby state is set, a scanning operation through the scan path is started, information held in the memory units of each of the circuits in the main power supply region is read, and then thus read information is saved in an storage section in the backup power supply region.